JP2005064077A - Multilayer common mode choke coil and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayer common mode choke coil in which impedance is optimized in a normal mode and a common mode. <P>SOLUTION: The multilayer common mode choke coil comprises a nonmagnetic insulating material layer 20 forming first and second inner conductors 31 and 32 of laterally separated bifilar windings by laying a plurality of nonmagnetic insulating materials in layers, and nonmagnetic material layers 15 and 16 arranged on upper and lower surfaces of the nonmagnetic insulating material layer 20. The nonmagnetic insulating material layer 20 comprises a second nonmagnetic insulating material 22 where the first and second inner conductors 31 and 32 of bifilar windings are formed laterally in opposite directions, and a third nonmagnetic insulating material 23 where first and second coupling conductors 33 and 34 for connecting the laterally inside ends of the first and second inner conductors 31 and 32 are formed. The second nonmagnetic insulating material 22 and the third nonmagnetic insulating material 23 are laid in a layer contiguously to each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multilayer common mode choke coil that removes common mode noise that intrudes into an electronic device and a method of manufacturing the same, and more particularly, to a multilayer common mode choke coil having a reduced impedance value in a normal (differential) mode and the same. It relates to a manufacturing method.
[0002]
[Prior art]
Conventionally, high-speed differential transmission lines such as USB (Universal Serial Bus), IEEE 1394 (Institut of Electrical and Electronics Engineers 1394) and LDVS (Low Voltage Different Line) used in personal computers and peripheral devices. A common mode choke coil is used to remove common mode noise.
[0003]
This common mode choke coil is a coil in which two or more coils are magnetically combined, and removes only the common mode component without affecting the normal mode component in the current conduction direction. It is comprised as follows. That is, it is necessary to minimize the normal mode impedance and to increase the common mode impedance as much as possible.
[0004]
As a conventional example of a common mode choke coil that employs a left and right separation type coil, a magnetic body and two adjacent coil portions provided inside the magnetic body are provided. Some have a portion with low magnetic permeability. In this case, the coil portion provided inside the magnetic body is composed of a pair of coils in which two conductive wires are wound in a solenoid shape in the same direction, and the ends of each coil are electrically connected to the terminals. It is said. (For example, see Patent Document 1)
Further, as a conventional example of a common mode choke coil employing a bifilar coil, the first to fourth conductors are spiral, and the first conductor and the second conductor are arranged substantially in parallel. A configuration is disclosed in which an insulator layer and a second insulator layer in which a third conductor and a fourth conductor are arranged substantially in parallel are stacked. In this case, the first conductor, the third conductor, the second conductor, and the fourth conductor are electrically connected through the through hole, and the second insulator layer includes the first insulator layer. Those having a lower magnetic permeability than the above are used. (For example, see Patent Document 2)
[0005]
[Patent Document 1]
JP-A-10-270256 (page 3, FIG. 2)
[Patent Document 2]
Japanese Patent Laying-Open No. 2003-31416 (page 3 to page 4, FIG. 1)
[0006]
[Problems to be solved by the invention]
By the way, according to the common mode choke coil described in Patent Document 1 described above, non-magnetic coupling occurs between the two coils of the coil portion, and thus the coupling coefficient is low. For this reason, there is a problem that the normal mode impedance becomes high.
[0007]
Moreover, the common mode choke coil described in Patent Document 2 described above can set the length (line length) of the inner conductor to be magnetically coupled by adopting bifilar winding. For this reason, since the impedance value of a common mode becomes high, the noise removal performance in the common mode can be enhanced.
However, when comparing the inner conductor arranged inside the spiral with the inner conductor arranged outside, it is inevitable that the effective lengths arranged in parallel are different from each other. For this reason, since the inner and outer coils (inner conductors) cannot cancel each other's magnetic fluxes with respect to the normal mode, that is, since magnetic coupling cannot be performed, the coupling coefficient is lowered and the impedance value of the normal mode is increased. Has the problem.
[0008]
As described above, when the impedance in the normal mode is high, the signal waveform may be rounded. Therefore, there is a concern that the high-speed signal waveform is affected.
The present invention has been made in view of the above circumstances, and can optimize the impedance in both the normal mode and the common mode (low in the normal mode and high in the common mode) and improve the noise removal characteristics. An object of the present invention is to provide a stacked common mode choke coil and a method of manufacturing the same.
[0009]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
The laminated common mode choke coil of the present invention includes a nonmagnetic insulating material layer that forms first and second inner conductors in which a plurality of nonmagnetic insulating materials are laminated to form a bifilar winding of left and right separation types, and the nonmagnetic insulating material A laminated common mode choke coil in which a laminate comprising magnetic material layers arranged on both upper and lower surfaces of a layer is provided with external electrodes connected to the first and second internal conductors. ,
The non-magnetic insulating material layer includes a non-magnetic insulating material A in which the first and second inner conductors are formed in a bifilar winding in a left-right reverse direction, and left and right inner ends of the first and second inner conductors. And a non-magnetic material B formed with first and second connecting conductors for connecting the non-magnetic material B, and the non-magnetic insulating material A and the non-magnetic material B are laminated adjacent to each other. To do.
[0010]
According to such a laminated common mode choke coil, the first and second inner conductors that are separated by left and right bifilar are formed in opposite directions and connected by the first and second connecting conductors. By adopting bifilar winding, the wire length of the inner conductor to be magnetically coupled can be set long, and because the left and right bifilar windings are reversed, the coupling coefficient between the first inner conductor and the second inner conductor is high, and the inside and outside are smooth The inner conductors having the same line length can be formed by replacing them.
That is, for example, an inner conductor having a long line length disposed on the outer side on the left side is an inner conductor having a short line length disposed on the inner side on the right side, so that the lengths of the first inner conductor and the second inner conductor are equal. Thus, a high coupling coefficient can be obtained, and the impedance value in the normal mode is reduced by increasing the mutual magnetic coupling. In addition, since the effective length of the inner conductors arranged in parallel to each other and magnetically coupled can be sufficiently secured, the common mode impedance value is increased.
[0011]
In the laminated common mode choke coil, it is preferable that a plurality of the nonmagnetic insulating materials A are laminated and bifilar windings in opposite directions are multilayered, thereby further increasing the line length of the magnetically coupled inner conductor. Can be set.
[0012]
The method for manufacturing a laminated common mode choke coil according to the present invention includes a nonmagnetic insulating material layer that forms first and second inner conductors in which a plurality of nonmagnetic insulating materials are laminated to form a bifilar winding of left and right separation types, A laminated common mode choke coil in which an external electrode connected to the first and second inner conductors is provided in a laminate comprising magnetic material layers disposed on both upper and lower surfaces of a magnetic insulating material layer The non-magnetic insulating material layer includes a non-magnetic insulating material A in which the first and second inner conductors are formed in a bifilar winding in opposite directions, and the first and second inner layers. A nonmagnetic material B on which first and second connecting conductors that connect the left and right inner ends of the conductors are adjacently stacked, and bifilar windings in opposite directions are connected by the first connecting conductors. Before A first inner conductor, is characterized in that the effective length of the left and right reverse bifilar the second the second inner conductor formed by connecting a connecting conductor is set equal.
[0013]
According to such a method for manufacturing a laminated common mode choke coil, the first and second inner conductors are formed of a nonmagnetic insulating material A formed in bifilar windings in opposite directions, and the first and second inner conductors. A non-magnetic material B on which first and second connecting conductors connecting the left and right inner ends of the inner conductor are connected to each other is laminated adjacently, and bifilar winding in the left-right reverse direction is made by the first connecting conductor. Since the effective lengths of the first inner conductor connected and the second inner conductor formed by connecting bifilar windings in opposite directions to each other by the second connecting conductor are set equal to each other, the normal mode A laminated common mode choke coil having a low impedance can be easily manufactured.
That is, when the first and second inner conductors are reversed in the left-right separated bifilar winding, the effective lengths of the first inner conductor and the second inner conductor are equal and a high coupling coefficient can be obtained. As a result, the impedance value in the normal mode is reduced. Further, by adopting the bifilar winding, the effective length of the internal conductors arranged in parallel to each other and magnetically coupled can be sufficiently ensured, so that the common mode impedance value becomes high.
[0014]
In the above method for manufacturing a laminated common mode choke coil, it is preferable that a plurality of the nonmagnetic insulating materials A are laminated, and bifilar windings in opposite directions are multilayered, whereby the line length of the inner conductor to be magnetically coupled is increased. Can be set longer.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a laminated common mode choke coil (hereinafter referred to as a “common mode choke coil”) and a method for manufacturing the same according to the present invention will be described with reference to the drawings.
<First Embodiment>
1 is an exploded perspective view of a common mode choke coil showing a first embodiment of the present invention, FIG. 2 is an external perspective view of the common mode choke coil showing a completed state of FIG. 1, and FIG. 3 is a common mode choke according to the present invention. It is a disassembled perspective view which shows the mode of the magnetic coupling of a coil.
[0016]
1 and 2, reference numeral 10 in the drawing indicates a common mode choke coil. The common mode choke coil 10 has a configuration in which a plurality of sheet-like nonmagnetic insulating materials and magnetic materials are laminated and integrated. In addition, on the two opposing side surfaces of the common mode choke coil 10 formed as a substantially rectangular parallelepiped laminate, four external electrodes 11, 12, 13, 14 are distributed.
In the configuration example shown in FIG. 1, magnetic material layers 15 and 16 each consisting of one or a plurality of layers are arranged on both upper and lower end faces of a common mode choke coil 10 that is a laminate. Between the upper and lower magnetic material layers 15 and 16, a nonmagnetic insulating material layer 20 composed of at least two layers is disposed.
[0017]
Each of the magnetic material layers 15 and 16 has a structure in which magnetic materials 15a, 15b, and 15c and magnetic materials 16a, 16b, and 16c are stacked in three layers. Here, the magnetic material layers 15 and 16 preferably have high transmittance, and usable sheet-like magnetic materials include, for example, Ni—Zn ferrite and Ni—Zn—Cu ferrite.
The magnetic material layers 15 and 16 are not limited to the three layers described above, and can be appropriately changed according to the type and thickness of the magnetic material.
[0018]
The nonmagnetic insulating material layer 20 includes a first nonmagnetic insulating material 21, a second nonmagnetic insulating material (nonmagnetic insulating material A) 22, a third nonmagnetic insulating material (nonmagnetic insulating material B) 23, and a first nonmagnetic insulating material 21, from the upper surface side. In the order of the 4 nonmagnetic insulating materials 24, a sheet-like nonmagnetic insulating material is laminated in four layers. Here, examples of the sheet-like nonmagnetic insulating material that can be used as the nonmagnetic insulating material layer 20 include a ceramic material such as alumina, a glass material such as silica, and a resin material such as polyimide resin.
In addition, about the 1st nonmagnetic insulating material 21 and the 4th nonmagnetic insulating material 24, it is good according to various conditions, or it is good also considering each as two or more layers.
[0019]
Of the four layers of the above-described nonmagnetic insulating material, the first inner conductor 31 and the second inner conductor 32 that are separated by left and right bifilar winding are provided on the upper surface side of the second nonmagnetic insulating material 22 serving as an intermediate layer. Is provided.
The first inner conductor 31 has a spiral (spiral) first left conductor 31 a and a first right conductor 31 b connected by a first connecting conductor 33 formed in the third nonmagnetic insulating material 23 and continuously integrated. It is formed to do. Similarly, the second left conductor 32a and the second right conductor 32b, which are also spiral, are connected to each other by the second connecting conductor 34 formed on the third nonmagnetic insulating material 23 and continuously integrated. It is formed to do.
Each of these conductors 31a, 31b, 32a, 32b, 33, and 34 is formed on the surface of a nonmagnetic insulating material by a known method such as printing or plating with a conductor such as silver.
[0020]
Among these, the first left conductor 31a is formed in a spiral shape having one or more turns, and the second left conductor 32a is disposed substantially in parallel inside the first left conductor 31a so as not to short-circuit each other. That is, when the first left conductor 31a and the second left conductor 32a are combined into one set, this set is in a spiral shape with bifilar winding, and the spiral direction is the first left conductor 31a in a top view. And the second left conductor 32a is in the same direction (right-handed in the illustrated example).
The first right conductor 31b has a spiral shape having one or more turns, and the second right conductor 32b is arranged substantially in parallel outside the first right conductor 31b so as not to short-circuit each other. That is, when the first right conductor 31b and the second right conductor 32b are made into one set, this one set has a spiral shape in which the inside and the outside are interchanged and bifilar wound, and the spiral direction in the top view is Both the first right conductor 31b and the second right conductor 32b are in the same direction (left-handed in the illustrated example).
[0021]
An extraction electrode portion 35 connected to the external electrode 11 is formed at one end of the first left conductor 31a, that is, an end outside the spiral, and the other end of the first left conductor 31a, that is, the spiral. Is connected to one end 33a of the first connecting conductor 33 formed in the third nonmagnetic insulating material 23 through the through hole 22a. On the other hand, an extraction electrode portion 37 connected to the external electrode 12 is formed at one end portion of the first right conductor 31b, that is, an end portion outside the spiral, and the other end portion of the first right conductor 31b, That is, the end which becomes the inside of the spiral is connected to the other end 33b of the first connecting conductor 33 formed in the third nonmagnetic insulating material 23 through the through hole 22c.
Therefore, the first conductor 31 has spirals (first left conductor 31a and first right conductor 31b) in opposite directions between the extraction electrodes 35 and 37 at both ends, and both spirals are connected by the first connecting conductor 33. It will be continuous continuously.
[0022]
Further, an extraction electrode 36 connected to the external electrode 13 is formed at one end of the second left conductor 32a, that is, an end that is outside the spiral, and the other end of the second left conductor 32a, The end part which becomes the inner side of the spiral is connected to one end 34a of the second connecting conductor 34 formed in the third nonmagnetic insulating material 23 through the through hole 22b. On the other hand, an extraction electrode portion 38 connected to the external electrode 14 is formed at one end portion of the second right conductor 32b, that is, an end portion outside the spiral, and the other end portion of the second right conductor 32b, In other words, the end that is the inner side of the spiral is connected to the other end 34b of the second connecting conductor 34 formed in the third nonmagnetic insulating material 23 through the through hole 22d.
Therefore, the second conductor 32 is provided with spirals (second left conductor 32a and second right conductor 32b) in opposite directions between the lead electrodes 36 and 38 at both ends, and both spirals are connected by the second connecting conductor 34. It will be continuous continuously.
[0023]
Thus, the non-magnetic insulating material layer 20 includes a first left-hand conductor 31a and a second left-hand conductor 32a with a right-handed bifilar winding, and a first right-hand conductor 31b and a second right-hand conductor 32b with a left-handed bifilar winding. Are adjacent to each other. When the left bifilar winding and the right bifilar winding are connected by the first connecting conductor 33 and the second connecting conductor 34, the inner and outer arrangements of the conductors are interchanged, and the winding direction is smoothly reversed. For this reason, the effective lengths of the first conductor 31 and the second conductor 32 are the lengths of the conductors arranged in parallel to each other except for the portions necessary for connection with the extraction electrodes 35, 36, 37, 38. The bifilar winding can be used to secure a long overall length, and the length can be set to be the same.
[0024]
In other words, the left and right bifilar windings ignore the arrangement in which the inside and outside are reversed unless the first conductor 31 and the second conductor 32 are distinguished in the effective length portion excluding the connection portion with the lead conductor. In this case, since the left and right sides have exactly the same shape, the lengths are naturally equal.
This is because by using the first connecting conductor 33 and the second connecting conductor 34 provided in the third nonmagnetic insulating material 23, the left and right separation type bifilar winding with the winding direction reversed is not short-circuited. This is possible due to the configuration in which the inner ends are connected to each other.
[0025]
Here, the conductor path of the first inner conductor 31 will be described in detail. From the outer electrode 11 to the through hole 22a via the lead electrode 35 of the second nonmagnetic insulating material 22 and the first left conductor 31a, It is electrically connected to the first connecting conductor 33 (on the one end 33a side) of the third nonmagnetic insulating material 23 through the through hole 22a. The first connecting conductor 33 is electrically connected to the first right conductor 31b through the through hole 22c from the other end 33b side, and is connected to the extraction electrode 12 via the first right conductor 31b and the extraction electrode 37. Is done.
The conductor path of the second inner conductor 32 will be described in detail. From the external electrode 13 to the through hole 22b via the lead electrode 36 of the second nonmagnetic insulating material 22 and the second left conductor 32a, the through hole 22b is formed. It is electrically connected to the second linking conductor 34 (on the one end 34a side) of the third nonmagnetic insulating material 23 through the hole 22b. The second connecting conductor 34 is electrically connected to the second right conductor 32b through the through hole 22d from the other end 34b side, and is connected to the external electrode 14 through the second right conductor 32b and the lead electrode 38. .
[0026]
A method for manufacturing the common mode choke coil 10 of the present invention configured as described above will be described below.
First, a sheet-like first nonmagnetic insulating material 21, a second nonmagnetic insulating material 22, a third nonmagnetic insulating material 23, and a fourth nonmagnetic insulating material 24 having a predetermined shape (for example, rectangular shape) are manufactured. .
Next, through holes 22a, 22b, 23a, and 23b are formed at predetermined positions of the second nonmagnetic insulating material 22 by a known technique such as laser or punching.
[0027]
Next, on the upper surface of the second nonmagnetic insulating material 22, the first left conductor 31a, the second left conductor 32a, and the second left conductor 31a are wound so that the winding direction is reversed left and right, and each is a left and right separated bifilar winding of one turn or more. The first right conductor 31b and the second right conductor 32b are formed so as not to be short-circuited by using a known method such as printing or plating.
In addition, at a predetermined position on the upper surface of the third nonmagnetic insulating material 23, a straight first connection conductor 33 that connects the through holes 22a and 22c of the second nonmagnetic insulating material 22 in a stacked state, and the through holes 22b, The straight second connecting conductors 34 connecting 22d are formed by a known method such as printing or plating.
[0028]
At this time, the extraction electrode 35 is provided at one end of the first left conductor 31a, the extraction electrode 36 is provided at one end of the second left conductor 32a, the extraction electrode 37 is provided at one end of the first right conductor 31b, and the second right conductor. An extraction electrode 38 is integrally formed continuously at one end of 32b. The through holes 22a, 22b, 23a, and 23b are filled with a conductive material such as silver so as to be continuous with the conductor formed in the nonmagnetic insulating material provided with the through holes. The conductor on the nonmagnetic insulating material side connected through the through hole is electrically connected by contacting the conductor of the through hole by providing a convex electrode portion (not shown) at the end of the conductor. It has become so.
[0029]
Next, the first nonmagnetic insulating material 21, the second nonmagnetic insulating material 22, the third nonmagnetic insulating material 23, and the fourth nonmagnetic insulating material 24 are laminated to form the nonmagnetic insulating material layer 20. Accordingly, the first left conductor 31a, the first right conductor 31b, and the first connecting conductor 33 are electrically connected through the through holes 22a and 22c, and the second left conductor 32a, the second right conductor 32b, and the second conductor The two connecting conductors 34 are electrically connected through the through holes 22b and 22d.
In addition, the magnetic material layers 15 and 16 are laminated | stacked up and down so that the nonmagnetic material layer 20 may be pinched | interposed, and a laminated body is completed.
[0030]
The common mode choke coil 10 described above may be laminated by forming a plurality of sets of internal conductors at a predetermined pitch with respect to each nonmagnetic insulating material. In this case, the above-described common mode choke coil 10 is cut by dicing or the like. A large number of laminates can be produced simultaneously.
Finally, external electrodes 11, 12, 13, and 14 made of a conductor such as silver are formed by connecting to the extraction electrodes 35, 36, 37, and 38 exposed on opposite side surfaces of the laminated body, respectively, A common mode choke coil having a configuration is manufactured. By such a manufacturing method, it is possible to easily manufacture the left-right separated bifilar wound common mode choke coil 10 in which the effective lengths of the first inner conductor 31 and the second inner conductor 32 are equal.
The external electrodes 11, 12, 13, and 14 may be plated on the upper surface of a conductor such as silver as necessary.
[0031]
The common mode choke coil 10 configured as described above has a sufficient length for the first inner conductor 31 and the second inner conductor 32 as a bifilar winding of a left and right separation type. Therefore, the common mode impedance value can be increased and the normal mode impedance value can be suppressed low.
[0032]
FIG. 3 is a diagram showing a state of magnetic coupling in the common mode in the common mode choke coil 10 described above.
In this case, since the lengths of the first inner conductor 31 and the second inner conductor 32 are set to be equal to each other, the first left conductor 31a and the second left conductor 32a influence each other so that the magnetic fields as indicated by arrows Z1 and Z2 are generated. At the same time, the first right conductor 31b and the second right conductor 32b influence each other and magnetically couple as indicated by arrows Z3 and Z4. As a result, as shown by the arrow Z5, a large magnetic coupling is generated in the entire common mode choke coil 10, and the common mode impedance value can be improved.
That is, by ensuring a sufficient length of the inner conductor that contributes to magnetic coupling, the impedance value in the common mode is increased to improve noise removal performance, and the inner conductor that does not contribute to magnetic coupling is reduced as much as possible. Since the lengths of both inner conductors that contribute to the coupling are made equal, the common mode choke coil 10 of the laminated type that reduces the impedance value in the normal mode and easily flows current, that is, does not affect the high-speed signal waveform. It becomes.
[0033]
Further, as shown in FIG. 4, for example, the above-described common mode choke coil can be arranged in an array by stacking a plurality of the above-described configurations in the vertical direction. That is, the arrayed common mode choke coil 10A shown in FIG. 4 includes a first nonmagnetic material layer 20A, one or more magnetic materials 17 and a second nonmagnetic material layer between the magnetic material layers 15 and 16. It is set as the laminated body which has arrange | positioned 20B. In this case, when the first and second nonmagnetic material layers 20A and 20B are compared, each has an external electrode (not shown), and therefore the positions of the corresponding extraction electrodes 35, 36, 37, and 38 are different. However, the other structure is the same as the nonmagnetic material layer 20 described above with reference to FIG.
[0034]
<Second Embodiment>
FIG. 5 is an exploded perspective view of a common mode choke coil showing a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment described above, and the detailed description thereof is omitted. .
This common mode choke coil 10B is formed by separating a nonmagnetic insulating material in which first and second inner conductors are formed as a bifilar winding of left and right layers into two or more layers, and between the inner conductors formed in each layer. Are connected by a through hole to form a first inner conductor 41 and a second inner conductor 42 having a long line length.
[0035]
The nonmagnetic insulating material layer 20C in FIG. 5 includes a first nonmagnetic insulating material 21 and third nonmagnetic insulating materials 22 ', 22A, 22B, a third nonmagnetic insulating material 23, and a fourth nonmagnetic insulating material 23. In the order of the magnetic insulating material 24, a sheet-like nonmagnetic insulating material is laminated in six layers. The sheet-like nonmagnetic insulating material that can be used as the nonmagnetic insulating material layer 20C includes, for example, a ceramic material such as alumina, a glass material such as silica, and a resin material such as polyimide resin, and the first nonmagnetic insulating material. The material 21 and the fourth nonmagnetic insulating material 24 may be eliminated depending on various conditions, or each may have two or more layers.
[0036]
Of the six layers of the nonmagnetic insulating material described above, the first inner conductor 41 that is a bifilar winding of the left and right separation type is provided on each upper surface side of the second nonmagnetic insulating material 22 ', 22A, 22B serving as an intermediate layer. And a second inner conductor 42 is provided.
The first inner conductor 41 has three layers of first left-hand conductors 41a, 41a ′, 41a ″ and first right-hand conductors 41b, 41b ′, 41b ″ in a spiral shape (spiral shape). The first connection conductors 33 are connected to each other so as to be integrally connected. Similarly, for the second inner conductor 42, the third left-side conductors 42 a, 42 a ′, 42 a ″ and the second right-side conductors 42 b, 42 b ′, 42 b ″, which are also spiral, are formed by the third nonmagnetic insulating material 23. The second connection conductors 34 are connected to each other so as to be continuous with each other.
Each of these conductors 33, 34, 41, and 42 is formed on the surface of a nonmagnetic insulating material by a known method such as printing or plating with a conductor such as silver.
[0037]
The second non-magnetic material 22 ′, which is the uppermost layer of the intermediate layer, is arranged substantially in parallel as a first left conductor 41 a having a spiral shape of one or more turns and a spiral shape having one or more turns inside. The second left conductor 42a is provided in a bifilar winding so as not to short-circuit each other. In this case, the spiral direction is the same for both the first left conductor 41a and the second left conductor 42a in the top view (right-handed in the illustrated example).
Further, the first right conductor 41b of the second nonmagnetic material 22 'is also formed in a spiral shape having one or more turns, and the second right conductor 42b is arranged substantially in parallel on the outer side thereof so as not to short-circuit each other. Is provided. The spiral direction in this case is the same direction (left-handed in the illustrated example) for both the first right conductor 41b and the second right conductor 42b in a top view, and the first and second inner and outer sides are the same as the left conductor described above. The arrangement is changed.
[0038]
An extraction electrode portion 35 connected to the external electrode 11 is formed at one end (outside of the spiral) of the first left conductor 41a. The other end (the inside of the spiral) of the first left conductor 41a is one end (the inside of the spiral) of the first left conductor 41a 'formed in the second nonmagnetic insulating material 22A through the through hole 22a. ) It is connected to a.
On the other hand, an extraction electrode portion 37 connected to the external electrode 12 is formed at one end (outside of the spiral) of the first right conductor 41b, and the other end (inside of the spiral) passes through the through hole 22c. And is connected to one end (the inside of the spiral) c of the first left conductor 41b 'formed in the second nonmagnetic insulating material 22A.
[0039]
The second nonmagnetic material 22A includes a first left conductor 41a 'that is also spiraled with one or more turns, and a second left conductor 42a' that is disposed substantially in parallel as a spiral having one or more turns inside. However, the bifilar winding is provided so as not to short-circuit each other. In this case, the spiral direction is the same for both the first left conductor 41a 'and the second left conductor 42a' in the top view (right-handed in the illustrated example).
Further, the first right conductor 41b 'of the second nonmagnetic material 22A is also formed in a spiral shape having one or more turns, and the second right conductor 42b' is disposed substantially parallel to the outside thereof so as not to short-circuit each other. It is provided on the winding. The spiral direction in this case is the same direction (left-handed in the illustrated example) for both the first right conductor 41b 'and the second right conductor 42b' when viewed from above, and the first and second conductors described above are the first and second conductors. It becomes the arrangement where the inside and outside are switched.
[0040]
One end (inside of the spiral) of the first left conductor 41a ′ is connected to the first left conductor 41a, and the other end (outside of the spiral) is connected to the second nonmagnetic via the through hole 22a ′. It is connected to one end (outside of the spiral) e of the first left conductor 41a ″ formed in the insulating material 22B.
Similarly, one end (inside of the spiral) of the second left conductor 41b ′ is connected to the second left conductor 41b, and the other end (outside of the spiral) is connected through the through hole 22b ′. The second left conductor 41b ″ formed on the second nonmagnetic insulating material 22B is connected to one end (outside of the spiral) f of the second left conductor 41b ″.
[0041]
The first right conductor 42a 'has one end c (inside of the spiral) connected to the first right conductor 42a and the other end (outside of the spiral) is connected to the second via the through hole 22c'. The first right conductor 42a ″ formed on the nonmagnetic insulating material 22B is connected to one end (outside of the spiral) g of the first right conductor 42a ″.
Similarly, one end (inside of the spiral) of the second right side conductor 42b ′ is connected to the first right conductor 42b, and the other end (outside of the spiral) is connected via the through hole 22d ′. The second right conductor 42b ″ formed on the second nonmagnetic insulating material 22B is connected to one end (outside of the spiral) h of the second right conductor 42b ″.
[0042]
The second nonmagnetic material 22B includes a first left conductor 41a ″ that is also spiraled with one or more turns, and a second left conductor 42a ″ that is disposed substantially in parallel as a spiral having one or more turns inside. However, the bifilar winding is provided so as not to short-circuit each other. In this case, the spiral direction is the same for both the first left conductor 41a ″ and the second left conductor 42a ″ in the top view (right-handed in the illustrated example).
Further, the first right conductor 41b ″ of the second nonmagnetic material 22B is also formed in a spiral shape having one or more turns, and the second right conductor 42b ″ is disposed substantially parallel to the outside thereof so as not to short-circuit each other. It is provided on the winding. The spiral direction in this case is the same direction (left-handed in the illustrated example) for both the first right conductor 41b ″ and the second right conductor 42b ″ in top view, and the first and second conductors described above are the first and second conductors. It becomes the arrangement where the inside and outside are switched.
[0043]
One end (outside of the spiral) of the first left conductor 41a ″ is connected to the first left conductor 41a ′, and the other end (inside of the spiral) is connected to the third non-conductor via the through hole 22a ″. The first connection conductor 33 formed on the magnetic insulating material 23 is connected to one end 33a.
Similarly, one end (outside of the spiral) of the second left conductor 41b ″ is connected to the second left conductor 41b ′, and the other end (inside of the spiral) is connected through the through hole 22b ″. Are connected to one end 34 a of the second connecting conductor 34 formed in the third nonmagnetic insulating material 23.
[0044]
The first right conductor 42a ″ has one end (outside of the spiral) connected to the first right conductor 42a ′, and the other end (inside the spiral) has the end through the through hole 22c ″. 3 is connected to the other end 33 b of the first connecting conductor 33 formed in the nonmagnetic insulating material 23.
Similarly, one end (outside of the spiral) of the second right conductor 42b ″ is connected to the first right conductor 42b ′, and the other end (inside of the spiral) is connected through the through hole 22d ″. And connected to the other end 34 b of the second connecting conductor 34 formed in the third nonmagnetic insulating material 23.
[0045]
Accordingly, the first conductor 41 is provided with spirals (first left conductors 41a, 41a ′, 41a ″ and first right conductors 41b, 41b ′, 41b ″) between the extraction electrodes 35, 37 at both ends, Both the spirals are connected by the first connecting conductor 33 and are continuously integrated.
Similarly, the second conductor 42 includes spirals (second left conductors 42a, 42a ′, 42a ″ and second right conductors 42b, 42b ′, 42b ″) between the extraction electrodes 36, 38 at both ends. Both spirals are connected by the second connecting conductor 34 and are continuously integrated.
[0046]
In this way, if the second non-magnetic material forming the left-right separation type bifilar winding is multilayered, the line length of the inner conductor that becomes the bifilar winding can be set even longer. Also, when the left bifilar winding and the right bifilar winding are connected by the first connecting conductor 33 and the second connecting conductor 34, the inside and outside arrangement of the conductors are interchanged, and the winding direction is smoothly reversed. The total length can be increased by making the effective lengths of the first conductor 41 and the second conductor 42 the same.
[0047]
Further, the second nonmagnetic materials 22 ′, 22A, and 22B described above may be multi-layered by stacking those manufactured in the same manner as the nonmagnetic material 22 described above.
Further, a plurality of common mode choke coils 10B having the configuration shown in FIG. 5 can be stacked in the vertical direction to form an array.
In addition, the structure of this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.
[0048]
【The invention's effect】
According to the laminated common mode choke coil of the present invention, the first and second inner conductors that are separated by left and right bifilar are formed in opposite directions and connected by the first and second connecting conductors. The lengths of the first inner conductor and the second inner conductor are equal to obtain a high coupling coefficient, and the mutual magnetic coupling is increased, whereby the impedance value in the normal mode is reduced. In addition, since the effective length of the inner conductors arranged in parallel to each other and magnetically coupled can be sufficiently secured, the common mode impedance value is increased. Therefore, since the impedance is optimized in both the normal mode and the common mode, a laminated common mode choke coil with improved noise removal characteristics can be obtained.
[0049]
In addition, according to the method of manufacturing the laminated common mode choke coil according to the present invention, the first inner conductor formed by connecting the bifilar winding in the left-right reverse direction with the first connecting conductor and the bifilar winding in the left-right reverse direction are the first. Since the effective length of the second inner conductor connected by the two connecting conductors is set to be equal, the impedance is optimized in both the normal mode and the common mode, and the laminated common has a low normal mode impedance. The mode choke coil can be easily manufactured, and an inexpensive and highly reliable product can be provided.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a multilayer common mode choke coil according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a completed state of FIG. 1;
FIG. 3 is a diagram showing a state of magnetic coupling in the stacked common mode choke coil of FIG. 1;
FIG. 4 is an exploded perspective view showing a stacked common mode choke coil arrayed as a modification of the present invention.
FIG. 5 is an exploded perspective view showing a laminated common mode choke coil according to a second embodiment of the present invention.
[Explanation of symbols]
10, 10A, 10B Multilayer common mode choke coil
(Common mode choke coil)
11, 12, 13, 14 External electrode
15, 16 Magnetic material layer
15a, 15b, 15c, 16a, 16b, 16c, 17 Magnetic material
20, 20A, 20B, 20C Non-magnetic insulating material layer
21 First non-magnetic insulating material
22, 22 ', 22A, 22B Second nonmagnetic insulating material (nonmagnetic insulating material A)
22a, 22a ', 22a "through hole
22b, 22b ', 22b "through hole
22c, 22c ', 22c "through hole
22d, 22d ', 22d "through hole
23 Third nonmagnetic insulating material (nonmagnetic insulating material B)
24 4th nonmagnetic insulating material
31, 41 First inner conductor
31a, 41a, 41a ′, 41a ″ first left conductor
31b, 41b, 41b ′, 41b ″ first right conductor
32, 42 Second inner conductor
32a, 42a, 42a ′, 42a ″ second left conductor
32b, 42b, 42b ', 42b "second right conductor
33 First connecting conductor
34 Second connecting conductor
35, 36, 37, 38 Extraction electrode

Claims (4)

A nonmagnetic insulating material layer which forms first and second inner conductors in which a plurality of nonmagnetic insulating materials are stacked and left and right separated bifilar windings are formed, and magnetic material layers disposed on both upper and lower surfaces of the nonmagnetic insulating material layer A laminated common mode choke coil provided with an external electrode connected to the first and second internal conductors in a laminate comprising:
The non-magnetic insulating material layer includes a non-magnetic insulating material A in which the first and second inner conductors are formed in a bifilar winding in a left-right reverse direction, and left and right inner ends of the first and second inner conductors. And a non-magnetic material B formed with first and second connecting conductors for connecting the non-magnetic material B, and the non-magnetic insulating material A and the non-magnetic material B are laminated adjacent to each other. Laminated common mode choke coil. A laminated common mode choke coil, wherein a plurality of nonmagnetic insulating materials A are laminated, and bifilar windings in opposite directions are multilayered. A nonmagnetic insulating material layer which forms first and second inner conductors in which a plurality of nonmagnetic insulating materials are stacked and left and right separated bifilar windings are formed, and magnetic material layers disposed on both upper and lower surfaces of the nonmagnetic insulating material layer A multilayer common mode choke coil manufacturing method in which an external electrode connected to the first and second internal conductors is provided in a multilayer body comprising:
The non-magnetic insulating material layer includes a non-magnetic insulating material A in which the first and second inner conductors are formed in a bifilar winding in a left-right reverse direction, and left and right inner ends of the first and second inner conductors. And the non-magnetic material B formed with the first and second coupling conductors for connecting the two, respectively, and laminated,
The first inner conductor formed by connecting bifilar windings reversed in the left-right direction with the first connecting conductor, and the second inner conductor formed by connecting bifilar windings reversed in the left-right direction with the second connecting conductor. The effective length is set to be equal to each other, and a method for manufacturing a laminated common mode choke coil is provided. 4. The method of manufacturing a laminated common mode choke coil according to claim 3, wherein a plurality of the nonmagnetic insulating materials A are laminated and bifilar windings in opposite directions are multilayered.

Images